Ammonia solution

Ammonia solution
Names
	IUPAC name Ammonium hydroxide
	Other names Ammonia water;
Identifiers
CAS Number	1336-21-6 ; 7664-41-7;
3D model (JSmol)	Interactive image;
ChEBI	CHEBI:18219 ;
ChemSpider	14218 ;
ECHA InfoCard	100.014.225
EC Number	215-647-6;
E number	E527 (acidity regulators, ...)
KEGG	C01358 ;
PubChem CID	14923;
RTECS number	BQ9625000;
UNII	5138Q19F1X ;
UN number	2672
CompTox Dashboard (EPA)	DTXSID4020080 ;
	InChI InChI=1S/H3N.H2O/h1H3;1H2 Key: VHUUQVKOLVNVRT-UHFFFAOYSA-N ; InChI=1/H3N.H2O/h1H3;1H2 Key: VHUUQVKOLVNVRT-UHFFFAOYAI;
	SMILES [OH2].[NH3];
Properties
Chemical formula	NH3(aq)
Molar mass	17.031 g/mol
Appearance	Colourless liquid
Odor	"Fishy", highly pungent
Density	0.91 g/cm3 (25 % w/w); 0.88 g/cm3 (35 % w/w)
Melting point	−57.5 °C (−71.5 °F; 215.7 K) (25 % w/w); −91.5 °C (35% w/w)
Boiling point	37.7 °C (99.9 °F; 310.8 K) (25 % w/w)
Solubility in water	Miscible
Magnetic susceptibility (χ)	−31.5×10−6 cm3/mol
Thermochemistry
Std molar; entropy (S⦵298)	111 J/(mol·K)
Std enthalpy of; formation (ΔfH⦵298)	−80 kJ/mol
Hazards
	Occupational safety and health (OHS/OSH):
Main hazards	Moderately toxic and irritating towards mucous membranes
	GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H302, H314, H335, H410
Precautionary statements	P261, P271, P273, P280, P303+P361+P353, P305+P351+P338
NFPA 704 (fire diamond)	3 1 0 COR
	Lethal dose or concentration (LD, LC):
LD50 (median dose)	100 — 200 mg/kg
Safety data sheet (SDS)	ICSC 0215 (10%-35% solution)
Related compounds
Other anions	Ammonium chloride; Ammonium cyanide
Other cations	Tetramethylammonium hydroxide
Related compounds	Ammonia; Hydroxylamine
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) Infobox references

Ammonia solution, also known as ammonia water, ammonium hydroxide, ammoniacal liquor, ammonia liquor, aqua ammonia, aqueous ammonia, or (inaccurately) ammonia, is a solution of ammonia in water. It can be denoted by the symbols NH₃(aq). Although the name ammonium hydroxide suggests a salt with the composition [NH⁺
₄][OH⁻
], it is impossible to isolate samples of NH₄OH. The ions NH⁺
₄ and OH⁻ do not account for a significant fraction of the total amount of ammonia except in extremely dilute solutions.

The concentration of such solutions is measured in units of the Baumé scale (density), with 26 degrees Baumé (about 30% of ammonia by weight at 15.5 °C or 59.9 °F) being the typical high-concentration commercial product.